At the same link, John points out the emails reveal the less-than-scientific interests of the researchers:

What they reveal, more than anything, is a bunker mentality. These pro-global warming scientists see themselves as under siege, and they view AGW skeptics as bitter enemies. They are often mean-spirited; the web site American Thinker is referred to as "American Stinker;" at one point an emailer exults in the death of a global warming skeptic; another one suggests that the Ph.D. of a prominent skeptic should be revoked because of an error he made decades ago in his dissertation; another says that he is tempted to "beat the crap out of" the same scientist. The emails show beyond any reasonable doubt that these individuals are engaged in politics, not science.